Answer:
proportional graph is a straight line that always goes through the origin. A non-proportional graph is a straight line that does not go through the origin.
Step-by-step explanation:
1. x = 0
2. x= 0
3. x = 10
4. x = -4
5. x = 0
6. x = -1
i think it is 15
it can be a pain when nobody helps... ur top right is correct
heres a screenshot ..